Malicious PDF — malware analysis report

Static analysis result for SHA-256 baafb7e73fa0330e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 22:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e797e2676becb95b52c4daff90041a87 SHA-1: 7eae4626c8fe09fedbca703c01ec6aaa8a9428b3 SHA-256: baafb7e73fa0330e05399d82eeded268304c85f257521171c5f7046a16bc1284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially disposable hosting. The primary purpose appears to be redirecting users to external, untrusted resources, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0679df110---10365113786.pdf In PDF document text
    • https://victorybear-info.com/userfiles/files/lenosafugubi.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/miniximogapuwujokotumoz.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/jevagedopawar.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/88956350f469ce3ed0707f6efc502227/xazaji.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/8ds0r28mhqdlr1v71l1rb1uhv4/jorojol.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/7058830543.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/23105333566.pdfIn PDF document text
    • http://keacg.com/upload/files/54195334200.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/pipur.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/59674578377.pdfIn PDF document text
    • http://goref.ru/files/file/nimopobidutuladutosod.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e8932fec73b878d4bbd019f1131343f6/9855686500.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/lunotifijok.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/kawefojozetugagajinilem.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/nenivegatoto.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/20735290497.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb705c28c3---47688746795.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b571c07795---xedujep.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/raxegatamekavit.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/sewifonus.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/7881674836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=modelo+atomico+de+thomson+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 10776 bytes
SHA-256: 05d30e33a10d40fe47a83abfad8832a660463caf6e3e345db8683a76848d48d8
font_01_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 20588 bytes
SHA-256: bc71727aa463791793cb17a94c947cf974dea3e69e438ff7e14a01d903aa77a6
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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